Triple-Slash Line

What is Triple-Slash Line?

A statistical line in baseball that displays the Batting
Average, On-Base Percentage and Slugging Percentage, which gives a
statistical overview on a players batting performance. Batting
Average considers the rate at which a player gets a hit, On-Base
Percentage considers the rate at which a player gets on base and
Slugging Percentage considers the rate of power hits of a
player.

Sporting Charts explains Triple-Slash Line

The Triple-Slash Line gives a quick overview of the players
batting performance and type and covers not only their hitting rate
but how often they get on base and if they have extra base hits and
home runs.

An elite player will usually have a Triple-Slash Line greater
than 0.300/0.400/0.500.